[flatcar] add python dependency check for helm-apps (#10192)

* add pyyaml install via task instead of package

* Change condition for better consistency in the codebase

roles/kubernetes-apps/helm/tasks/main.yml

@@ -17,6 +17,11 @@
   package:
     name: "{{ pyyaml_package }}"
     state: present
+  when: pyyaml_package is defined
+
+- name: Helm | Install PyYaml [flatcar]
+  include_tasks: pyyaml-flatcar.yml
+  when: ansible_os_family in ["Flatcar", "Flatcar Container Linux by Kinvolk"]
 
 - name: Helm | Download helm
   include_tasks: "../../../download/tasks/download_file.yml"

roles/kubernetes-apps/helm/tasks/pyyaml-flatcar.yml

+---
+- name: Get installed pip version
+  command: "{{ ansible_python_interpreter if ansible_python_interpreter is defined else 'python' }} -m pip --version"
+  register: pip_version_output
+  ignore_errors: yes
+  changed_when: false
+
+- name: Get installed PyYAML version
+  command: "{{ ansible_python_interpreter if ansible_python_interpreter is defined else 'python' }} -m pip show PyYAML"
+  register: pyyaml_version_output
+  ignore_errors: yes
+  changed_when: false
+
+- name: Install pip
+  command: "{{ ansible_python_interpreter if ansible_python_interpreter is defined else 'python' }} -m ensurepip --upgrade"
+  when: (pyyaml_version_output is failed) and (pip_version_output is failed)
+
+- name: Install PyYAML
+  ansible.builtin.pip:
+    name:
+      - PyYAML
+  when: (pyyaml_version_output is failed)